Add APIs to initialize XGMI speed, width details and get to max
bandwidth supported. It is assumed that a device only supports same
generation of XGMI links with uniform width.
Signed-off-by: Lijo Lazar <lijo.lazar@xxxxxxx>
---
v2:
Use GC versions as XGMI version is not populated for all SOCs (Hawking)
Rename xgmi_init_info to early_init
Denote speeds in MT instead of GT, rename enums accordingly. Don't
associate enum with protocol version as speed is dependent on PHY.
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 48 ++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h | 11 ++++++
2 files changed, 59 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index 03d909c7b14b..f303ec159cd5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -1679,3 +1679,51 @@ bool amdgpu_xgmi_same_hive(struct amdgpu_device *adev,
adev->gmc.xgmi.hive_id &&
adev->gmc.xgmi.hive_id == bo_adev->gmc.xgmi.hive_id);
}
+
+static inline uint32_t
+__amdgpu_xgmi_get_max_bandwidth(uint8_t link_width,
+ enum amdgpu_xgmi_link_speed max_speed)
+{
+ /* Returns unidirectional bandwidth in Mbps */
+ return max_speed * link_width;
+}
+
+/**
+ * amdgpu_xgmi_get_max_bandwidth - Get max possible bandwidth of a single XGMI
+ * link of the device in Mbps
+ * @adev: Target device.
+ *
+ * Gets the max possible bandwidth of a single XGMI link of the device in Mbps.
+ * Assumption is all links of the device have the same width and are of the
+ * same XGMI generation.
+ */
+uint32_t amdgpu_xgmi_get_max_bandwidth(struct amdgpu_device *adev)
+{
+ if (!adev->gmc.xgmi.supported)
+ return 0;
+
+ return __amdgpu_xgmi_get_max_bandwidth(adev->gmc.xgmi.max_width, adev->gmc.xgmi.max_speed);
+}
+
+void amdgpu_xgmi_early_init(struct amdgpu_device *adev)
+{
+ if (!adev->gmc.xgmi.supported)
+ return;
+
+ switch (amdgpu_ip_version(adev, GC_HWIP, 0)) {
+ case IP_VERSION(9, 4, 0):
+ case IP_VERSION(9, 4, 1):
+ case IP_VERSION(9, 4, 2):
+ adev->gmc.xgmi.max_speed = XGMI_SPEED_25MT;
+ adev->gmc.xgmi.max_width = 16;
+ break;
+ case IP_VERSION(9, 4, 3):
+ case IP_VERSION(9, 4, 4):
+ case IP_VERSION(9, 5, 0):
+ adev->gmc.xgmi.max_speed = XGMI_SPEED_32MT;
+ adev->gmc.xgmi.max_width = 16;
+ break;
+ default:
+ break;
+ }
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
index 044c4f6be44a..a711af24fb63 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
@@ -25,6 +25,12 @@
#include <drm/task_barrier.h>
#include "amdgpu_ras.h"
+enum amdgpu_xgmi_link_speed {
+ XGMI_SPEED_16MT = 16000,
+ XGMI_SPEED_25MT = 25000,
+ XGMI_SPEED_32MT = 32000
+};
+
struct amdgpu_hive_info {
struct kobject kobj;
uint64_t hive_id;
@@ -75,6 +81,8 @@ struct amdgpu_xgmi {
struct ras_common_if *ras_if;
bool connected_to_cpu;
struct amdgpu_xgmi_ras *ras;
+ enum amdgpu_xgmi_link_speed max_speed;
+ uint8_t max_width;
};
struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev);
@@ -102,4 +110,7 @@ int amdgpu_xgmi_request_nps_change(struct amdgpu_device *adev,
int amdgpu_get_xgmi_link_status(struct amdgpu_device *adev,
int global_link_num);
+void amdgpu_xgmi_early_init(struct amdgpu_device *adev);
+uint32_t amdgpu_xgmi_get_max_bandwidth(struct amdgpu_device *adev);
+
#endif
--
2.25.1
